References
- Jon Leech and Pat Brown, eds. "The OpenGL Graphics System, Version 2.0." Technical Specification, Silicon Graphics, Inc., 2004. Available from World Wide Web (http://www.opengl.org/documentation/specs/version2.0/glspec20. pdf). http://www.opengl.org/documentation/specs/version2.0/glspec20.pdf
- Justin Legakis. "Fast Multi-Layer Fog." Conference Abstracts and Applications (SIGGRAPH 98), p. 266. New York: ACM Press, 1998.